We had some forum discussion on this subject a few years ago.
Wikipedia also states:
"It is a popular belief that Kansas is the flattest state in the nation, reinforced by a well-known 2003 study stating that Kansas was indeed "flatter than a pancake". This has since been called into question, with most scientists ranking Kansas somewhere between 20th and 30th flattest state, depending on measurement method."
Highest point in Kansas is Mount Sunflower at a little over 4,000 feet at the Colorado border. Lowest point is 684, or so, feet in Montgomery County.
Aren't altitude and "flatness" two different things? Western Kansas is very flat, but has a much higher altitude that we do here. We have lots of hills and rolls where I am on the edge of the up slope of the piedmont, but Delaware's highest altitude anywhere is only 448 feet. Eastern Kansas, from north to south rolls, and is very hilly of course. I think that's one of the reasons it's so pretty.